Fix repository URL casing in package.json

Author: compulim

package.json

@@ -21,7 +21,7 @@
   },
   "repository": {
     "type": "git",
-    "url": "https://github.com/Microsoft/BotFramework-DirectLineJS"
+    "url": "https://github.com/microsoft/BotFramework-DirectLineJS.git"
   },
   "author": "Microsoft Corporation",
   "license": "MIT",